Editing Beryllium (section)

===Electronic===
Beryllium is a [[p-type semiconductor|p-type]] [[dopant]] in [[List of semiconductor materials|III-V compound semiconductors]]. It is widely used in materials such as [[gallium arsenide|GaAs]], [[AlGaAs]], [[InGaAs]] and [[InAlAs]] grown by [[molecular beam epitaxy]] (MBE).<ref>{{Cite book|url=https://books.google.com/books?id=oJs6nK3TZrwC&pg=PA104|page=104|title=High-power diode lasers|author=Diehl, Roland|publisher=Springer|date=2000|isbn=978-3-540-66693-6|access-date=30 October 2021|archive-date=27 July 2020|archive-url=https://web.archive.org/web/20200727094835/https://books.google.com/books?id=oJs6nK3TZrwC&pg=PA104|url-status=live}}</ref> Cross-rolled beryllium sheet is an excellent structural support for [[printed circuit board]]s in [[surface-mount technology]]. In critical electronic applications, beryllium is both a structural support and [[heat sink]]. The application also requires a coefficient of [[thermal expansion]] that is well matched to the alumina and [[glass-reinforced plastic|polyimide-glass]] [[Substrate (materials science)|substrates]]. The beryllium-beryllium oxide [[metal matrix composite|composite]] "[[E-Material]]s" have been specially designed for these electronic applications and have the additional advantage that the thermal expansion coefficient can be tailored to match diverse substrate materials.<ref name="Behrens-2003" />

[[Beryllium oxide]] is useful for many applications that require the combined properties of an [[electrical insulator]] and an excellent heat conductor, with high strength and hardness and a very high melting point. Beryllium oxide is frequently used as an insulator base plate in [[power semiconductor device|high-power]] [[transistor]]s in [[radio frequency]] [[transmitter]]s for telecommunications. Beryllium oxide is being studied for use in increasing the [[thermal conductivity]] of [[uranium dioxide]] [[nuclear fuel]] pellets.<ref>{{Cite web|url=http://www.purdue.edu/uns/html4ever/2005/050927.Solomon.nuclear.html|date=27 September 2005|title=Purdue engineers create safer, more efficient nuclear fuel, model its performance|publisher=Purdue University|access-date=18 September 2008|archive-date=27 May 2012|archive-url=https://web.archive.org/web/20120527141643/http://www.purdue.edu/uns/html4ever/2005/050927.Solomon.nuclear.html|url-status=live}}</ref> Beryllium compounds were used in [[fluorescent light]]ing tubes, but this use was discontinued because of the disease [[berylliosis]] which developed in the workers who were making the tubes.<ref>{{Cite book|pages=30–33|author=Breslin AJ|chapter=Ch. 3. Exposures and Patterns of Disease in the Beryllium Industry|isbn=978-0-12-671850-8|title=Beryllium: Its Industrial Hygiene Aspects|editor=Stokinger, HE |publisher=Academic Press, New York|date=1966}}</ref>